Guard for keyholes



J. E.-P0WERS.1

-GUARD FOR KEYHOLES.

APPLICATION FILED FEB-19,19l9- Patented May 25, 1920,, 1

awvewlloz ym/hum UNITE STATES PATENT OFFICE.

JOHN E. POWERS, OF PIKE, NEW YORK.

GUARD FOB KEYHOLES.

To all whom it may concern:

Be it known that I, JOHN E. PowERs, a citizen of the United States,residing at Pike, in the county of Wyoming and State of New York, haveinvented certain new and useful Improvements in Guards for Keyholes, ofwhich the following is a speclfication.

The object of this invention is to provide a new and improved form ofkeyhole guard which is adapted to cover the keyhole on the outside ofthe door and prevent the 1nsertion of any tools or a second key thereinfrom the outside of the door while one key is inserted on the inside ofthe door. The guard is held in place by the key that locks the door fromthe inside.

This and other objects of this invention will be fully illustrated inthe drawin described in the specification and pointec out in the claimat the end thereof.

In the accompanying drawing- Figure 1 is a perspectiveview of a portionof a door showing the keyhole on the inside of the door with a guardattached thereto.

Fig. 2 is a perspective view of the guard protecting the keyhole on theoutside of the door.

In the several figures of the drawing, like reference numerals indicatelike parts.

As shown in Fig. 1, the guard comprises the plate 1 which is providedwith an opening 2 corresponding in outline with that of the keyhole 8 ofthe lock. The plate 1 is fastened to the rod 3 by means of the set screw4 or any other suitable means. The rod or shaft 3 extends through thedoor which has on each side thereof suitable bearings in the face lates5 and 9, respectively, in which the shaft 3 is mounted to rotate.

The plates 8 and 9 have the keyhole 8 provided therein through which thekey is inserted to operate the lock 16. The face plate 5 is fastened tothe door by means of the screws 6 and the face plate 9 is fastened tothe door by means of the screws 11.

A disk 7 is keyed or otherwise suitably fastened to the rod 3 on theoutside of the door so as to swing in unison with the plate 1 and movetoward and away from the keyhole in the face plate 9 and cover oruncover this keyhole. Before the key is inserted from the inside to lockthe door, the

Specification of Letters Patent. Pgwgntefl la 25 1920.

Application filed February 19, 1919.

Serial No. 278,086.

plate is swung to position in line with the keyhole and the key is thenpassed through the holes in plate 1 and then into the key hole where itis used to lock the door. As long as the key remains in the keyhole itwill hold the plate 1 and shaft 3 from turning. In lining up the opening2 in the plate 1 with the keyhole the plate 1 is swung to the right andthis rocks the rod 3 which in turn swings the disk 7 on the outside ofthe door and moves it in front of the keyhole in face plate 9.

As long as the key remains in positionin the lock the plate 1 isprevented from turning away from the keyhole so that it will beimpossible to move the outer disk 7 to permit the inserting of a keyfrom the outside. When the key is withdrawn from the opening 2 in theplate 1 the disk will uncover the keyhole on the outside of the door assoon as the plate 1 is swung to the left away from the keyhole on theinside and then the lock is free to be unlocked or locked from theoutside as well as the inside.

In this manner the possibility of the entrance of an intruder who maymanipulate the key from the outside and then unlock the door by meansthereof or by means of a duplicate or pass key is prevented as long asthe key on the inside remains in position in the lock and holds theplate 1 from swing ing to the left which in turn prevents the disk 7from uncovering the keyhole on the outside of the door.

In order to protect the disk 7 from being bent out, etc., to uncover thekeyhole, a casing is formed around it. This casing comprises thecircular flange 13 and a semi-circular wall member 14 which spaces theflange from the face plate 9 and holds it in position thereon. One-halfof the wall member 14 is cut away at the right of the flange 13 in orderto allow the disk 7 to swing in and out between the flange 13 and theface plate 9.

To prevent the disk 7 from swinging'too far to the right a pin 12 isriveted to the disk. This pin projects into the curved guide slot 10provided in the face plate 9 which limits its travel in either directionfrom the keyhole at a predetermined point.

As shown in Fig. 2, the screws 11 for fastening the face plate 9 to thedoor are so arranged that when the disks cover the keyhole therein italso prevents access to these screws so that the face plate 9 itselfcannot be tampered with.

I claim:

In a guard for a keyhole, the combination of a rod mounted to rotateparallel to the keyhole, a locking plate mounted on one end of the saidrod, a guard disk mounted on the other end of said rod, said guard diskbeing adapted to be swung in front of one end of the keyhole on theswinging of said locking plate in front of the other end of the keyhole,said locking plate having an opening therein, a key adapted to passthrough the opening in said locking plate and-into the keyhole to holdsaid locking JOHN E. POWERS.

Witness:

JNo. l/V. SMITH.

